Do not test on Windows version that fail to run swift test

Author: JosephDuffy

.github/workflows/tests.yml

@@ -181,12 +181,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - branch: "swift-5.9.2-release"
-            tag: "5.9.2-RELEASE"
-          - branch: "swift-5.10.1-release"
-            tag: "5.10.1-RELEASE"
-          - branch: "swift-6.0.3-release"
-            tag: "6.0.3-RELEASE"
+          # Requires https://github.com/swiftlang/swift-package-manager/issues/6367 so can't use e.g. 6.0.3, 5.10.1, or 5.9.2.
           - branch: "swift-6.1.3-release"
             tag: "6.1.3-RELEASE"
           - branch: "swift-6.2.2-release"